Cirrus Logic CDB48500-USB - Manual (Page 7)

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between the PC, CS485XX, and the CDB USB MASTER
Figure 1-1. CDB48500-USB System Block Diagram
This document will concentrate on the features and basic operation of the CDB48500-USB board. Detailed
information regarding the operation and programming of the CS485XX DSP is covered by the CS485XX data
sheet, CS485XX Hardware User’s Manual, and application note AN298 (see
Section 1.2.2, “Related
Documentation” on page 1-4 for more details).
The CDB48500-USB is a convenient and easy-to-operate evaluation platform. It has been designed to
demonstrate the majority of the CS485XX functions on a small 6" x 6.5" base board. These features include:
• PC control of the CS485XX using the DSP Composer™ graphical user interface
• Serial control of audio devices on CDB48500 via I 2 C ® or SPI™ protocols
• Digital audio input of PCM via optical or coaxial S/PDIF (does not support compressed data input)
• Up to 12-channel analog audio input via the two CS42448 audio codecs
• Up to 12-channel analog output through the two CS42448 audio codecs
• Digital audio output of PCM data via optical S/PDIF
• Headphone output jack
• Multi-channel digital audio input via the CDB USB MASTER card (not yet supported)
• Separate input and output clocking domains to allow 1FS-to-2FS audio processing on the CS485XX
• Fast boot – host-controlled master boot (HCMB) of custom applications from 4 Mbit serial SPI flash device.
• Microphone input with integrated amplifier for Intelligent Room Calibration (IRC) evaluation (future)
• Supports all members of the CS485XX family in the 48-pin LQFP package.
Note: Not all features of the CS485xx are exercised on the CDB48500.
1.2.1 Identifying CDB48500-USB Components
Figure 1-2 shows the top side of the CDB48500-USB Evaluation Board. The accompanying legend identifies the
main components of the board.
CDB48500
Reset Signals
USB Port
Serial Control Interface
Board Control Signals
Audio Data (Future Development)
PC
CD
B USB MAS
T
ER